Missing pulse detector for a variable frequency source
Abstract
A missing pulse detector is provided which has the capability of monitoring a varying frequency pulse source to detect the loss of a single pulse or total loss of signal from the source. A frequency-to-current converter is used to program the output pulse width of a variable period retriggerable one-shot to maintain a pulse width slightly longer than one-half the present monitored pulse period. The retriggerable one-shot is triggered at twice the input pulse rate by employing a frequency doubler circuit connected between the one-shot input and the variable frequency source being monitored. The one-shot remains in the triggered or unstable state under normal conditions even though the source period is varying. A loss of an input pulse or single period of a fluctuating signal input will cause the one-shot to revert to its stable state, changing the output signal level to indicate a missing pulse or signal.
- Inventors:
-
- (Harriman, TN)
- (Concord, TN)
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
- OSTI Identifier:
- 863299
- Patent Number(s):
- 4142159
- Assignee:
- United States of America as represented by United States (Washington, DC) ORNL
- DOE Contract Number:
- W-7405-ENG-26
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- missing; pulse; detector; variable; frequency; source; provided; capability; monitoring; varying; detect; loss; single; total; signal; frequency-to-current; converter; output; width; period; retriggerable; one-shot; maintain; slightly; one-half; monitored; triggered; twice; input; rate; employing; doubler; circuit; connected; remains; unstable; normal; conditions; fluctuating; revert; stable; changing; level; indicate; signal level; signal input; pulse detector; circuit connected; variable frequency; output pulse; pulse width; output signal; input pulse; frequency source; single pulse; pulse rate; pulse source; missing pulse; normal conditions; pulse period; normal condition; varying frequency; frequency pulse; /327/
Citation Formats
Ingram, Charles B., and Lawhorn, John H. Missing pulse detector for a variable frequency source. United States: N. p., 1979.
Web.
Ingram, Charles B., & Lawhorn, John H. Missing pulse detector for a variable frequency source. United States.
Ingram, Charles B., and Lawhorn, John H. Mon .
"Missing pulse detector for a variable frequency source". United States. https://www.osti.gov/servlets/purl/863299.
@article{osti_863299,
title = {Missing pulse detector for a variable frequency source},
author = {Ingram, Charles B. and Lawhorn, John H.},
abstractNote = {A missing pulse detector is provided which has the capability of monitoring a varying frequency pulse source to detect the loss of a single pulse or total loss of signal from the source. A frequency-to-current converter is used to program the output pulse width of a variable period retriggerable one-shot to maintain a pulse width slightly longer than one-half the present monitored pulse period. The retriggerable one-shot is triggered at twice the input pulse rate by employing a frequency doubler circuit connected between the one-shot input and the variable frequency source being monitored. The one-shot remains in the triggered or unstable state under normal conditions even though the source period is varying. A loss of an input pulse or single period of a fluctuating signal input will cause the one-shot to revert to its stable state, changing the output signal level to indicate a missing pulse or signal.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}